> What will happen if domain-specific entities protect their specific regions and there are issues with other entities near-by?

Domain here meaning function, not territory. What we currently have for local law enforcement is mainly territory-based all-purpose paramilitary forces. (State and federal law enforcement is mostly divided among domain-specific agencies, most of which report to top-level departments with some focus other than generic law enforcement.)

> but by which force should domain specific forces not fight each other if central authority is disbanded?

No one has suggested disbanding central authority, either at local or higher levels, only disbanding centralized all-purpose local paramilitary law-enforcement agencies.

"Domain specific entities" means splitting up the many tasks currently handled by police into separate organizations specialized in those tasks -- public safety has different needs from traffic enforcement which has different needs from domestic disputes or mental health issues.

They don't mean regional fiefdoms.

The idea is to reduce the central militarized force with a plurality of nonviolent support services and unarmed law enforcement in addition to a significantly smaller force, trained and responsible for handling rampages, well-organized bank heists etc. If these domains intend to fight one another, let it happen in court.

> The idea is to reduce the central militarized force with a plurality of nonviolent support services and unarmed law enforcement

New-York inhabitant already thank you, especially given the radical upspike in violence since the NYPD defunding !

You can't have unarmed law enforcement against armed gang-bangers...

The fire department and police department are separate entities.

Subdividing the police department could work.

So could cross training police and firefighters. That's what they do in Sunnyvale CA.